SU1362562A1 - Arrangement for protecting a jet of metal with inert gas - Google Patents

Abstract

The decree relates to metallurgy - to the after-furnace treatment of metalB-B la. The goal is to improve the quality of the metal by increasing the range and stability of the jet. The device consists of a receiver 1 with oscillator 2 i. The receiver has inner 3 and outer 4 annular nozzles, in which annular bores are made. An annular rectangular bore 6 of the outer nozzle is made 1.1-1.2 in width by the width of the nozzle exit slit, and the internal width 5-10 is the width of the nozzle channel, with the upper wall of the bore spaced from the receiver wall at a distance of 7-10 times the width nozzle, and the top wall of the bore is separated from the nozzle section at a distance of 5 to 10 times the width of the nozzle channel. This design makes it possible to increase the reliability of gas protection and thereby improve (L. Quality of metal 1 Cp f-ly. / F il. Fig. 1

Description

The invention relates to metallurgy, more specifically to secondary treatment of steel.

The purpose of the invention is to improve the quality of the metal by increasing the range and stability of the gas jet.

Figure 1 shows the device, a general view; FIG. 2 is a section A-A in FIG. 1; Fig. 3 shows the node I in Fig. 1 (outer ring boring); 4 shows the assembly II in FIG. 1 (internal annular boring),.

The device consists of a receiver 1, a generator of 2 longitudinal vibrations, an inner annular nozzle 3, an outer annular nozzle 4. The outer annular nozzle is made in the form of a Lavap nozzle 5 having a stepped transition to an annular rectangular boring 6 having a width equal to 1.1 - 1 , 2 widths of nozzle exit. The inner annular nozzle 3 is provided with an inner bore 7 5–10 times as wide as the nozzle channel width, with the upper wall of the bore 7 or 10 times the distance from the nozzle section to the distance from the receiver wall 7 to 10 times the width of the bore channel. The distance is 5–10 times the width of the nozzle channel. The annular boring of the specified size and position of the best penetration of the protective gas jet into the metal jet due to additional longitudinal vibrations of high frequency, forming xc during the passage of gas through the annular boring.

Protection of the metal jet with an inert gas is carried out as follows.

In an inert gas, longitudinal vibrations are excited. Longitudinal gas oscillations reduce and dampen transverse vibrations and increase longitudinal vibrations. The increase in longitudinal vibrations increases the stability and long-range annular jets. Additional high-frequency oscillations are applied to the internal protective jet to improve mixing with the metal and enhance the penetration of an inert gas into the metal. An external protective jet additionally induces oblique shock waves, which dampen transverse vibrations and seal the surface of the jet. The amplification of longitudinal vibrations in the external jet reliably cuts off convective air flows, which destroy the annular jet, penetrate into the metal and reduce

quality ingot in the prototype. Internal protective structure refines the flow of metal.

A device for protecting a jet of metal with an inert gas during casting works as follows.

The inert gas through the generator 2 longitudinal oscillations enters the receiver 1. The external jet passes through the Laval nozzle 5, which has a stepped transition to an annular rectangular groove made behind the nozzle cut and having a width equal to U 1.1 - 1.2 the width of the output slice nozzles d. Gas jet pass

through a rectangular groove, in addition, about 5 presses by oblique irregular compaction, which increases the rigidity and range of the jet. The inner jet passes through the bore A wide by 5–10 times the width of the nozzle channel d, the upper wall of the growing glasses is 7–10 times larger than the wall of the nozzle channel dj and the lower wall of the boring is separated from the cutoff nozzles at a distance B are 5–10 times the width of the nozzle channel d. The internal jet, the passage through the bore, receives high-frequency vibrations, which improve the penetration of gas into the metal jet. The lower section of the nozzles of the protective jets is perpendicular to their forming, which additionally reduces the transverse oscillations in the jet, increasing the stability and range of the protective jets.

The addition of additional high-frequency oscillations to a jet with longitudinal oscillations improves the mixing processes of the annular jet with the liquid jet by 1.5-2.0 times. The induction of oblique shock waves into the annular jet increases the rigidity and range of the jet by 1.3 times.

Formula Invention

1. A device for protecting the metal jet 55 with an inert gas, comprising a housing with coaxially arranged annular nozzles and a gas supply nozzle, characterized in that, in order to improve the quality

metal by increasing the range and stability of the gas jet, it is equipped with an oscillator installed in the gas supply nozzle, in the upper part of the body there is an annular cavity connected with annular nozzles, the external annular nozzle is made in the form of a Laval nozzle with a stepwise transition into an annular rectangular groove width 1.1 and 1.2 times the width of the output medium

for the annular nozzle, and the inner one with an annular bore 5–10 widths of the nozzle, while the distance from the upper wall of the bore to the annular cavity is 7-10 the width of the nozzle, and from the lower one - 5 to 10 the width of the nozzle.

2. The device according to claim 1, characterized in that the lower section of the annular nozzles is perpendicular to their forming.

OJ /

Rig. 2

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Editor T. Parfenova

Compiled by R.Vasilyeva

Tehred A. Kravchuk Proofreader L. Pilipenko

Order 6337/8 Circulation 741 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

FIG. It

Claims (2)

Claim 1. A device for protecting a metal stream with an inert gas, comprising a housing with coaxially arranged annular nozzles and a pipe for supplying gas, characterized in that, in order to improve the quality of the metal by increasing the range and stability of the gas stream, it is equipped with an oscillator installed in the pipe for gas supply, an annular cavity is made in the upper part of the casing, connected with ring nozzles, the outer ring nozzle is made in the form of a Laval nozzle with a step transition into an annular rectangular the groove is 1.1–1.2 times the width of the outlet cut behind the annular nozzle, and the inside — with an annular bore 5–10 wide by the width of the nozzle, while the distance from the upper wall of the bore to the annular cavity is 7–10 the width of the nozzle, and from lower - 5 - 10 nozzle widths. 2. The device according to claim 1, t and h · 10 further that the lower cut of the annular nozzles is perpendicular to their generatrix .. Aa FIG. 2 of FIG. J FIG. 9